A communication device for performing cryptographically secured communication in a WLAN network is provided that comprises a security enhancement unit and a MAC unit. The sand is bonded within the joints upon contact with moisture. The polycrystalline silicon-germanium region can be, for example, a base contact in a heterojunction bipolar transistor while the single crystal silicon-germanium region can be, for example, a base in the heterojunction bipolar transistor. The storage nodes may be configured to store replicas of the data objects. or lower and a specific gravity of 3.